Welded tubes

Welded tubes are manufactured by forming a flat strip of aluminium and then joining the edges by a high-frequency-welding process.

The main difference to extruded and drawn tubes is the possibility to have a multi-layer material of different aluminium alloys. The clad layer is widely used in tubes for heat exchanger production to enable furnace or flame brazing and to give sacrificial corrosion resistance.

For industrial applications, where strength and formability are important factors, 5xxx-series alloys can be utilized having the advantage of very good dimensional stability.

Automotive applications

Flat oval tubes for radiators and heaters

Rectangular tubes for charge air coolers

Thick-walled oil coolers

Internal enhancements as dimples or turbulators to increase the heat transfer

Headers/manifolds for mobile A/C condensers

Headers/manifolds for battery coolers

Small-diameter tubes for connector lines

HVAC&R applications

Headers/manifolds for stationary condensers

Inner-grooved tubes with high heat transfer performance

Return bends with clad for mechanically expanded heat exchangers

Industrial applications

Ladders and scaffolding

Special tubes for child care, garden and forestry, orthopedical equipment, sports and adventure